If you let your cats outdoors, one of the first things it will do is eat grass. Then it will come inside and throw up that grass all over your floor or carpeting as a reward for letting it out in the first place.
Fortunately, eating grass is actually good for cats because it aids in digestion and provides vitamins and minerals (that wind up splattered next to hairballs on your floor). In case you don’t let your cat outside, consider buying it special grass so it can eat (and then vomit) indoors.
Grass is important for cats so be sure to make sure your cat gets enough nutrients that it needs. That way your cat can live longer and provide you with even more hairballs to clean up throughout your lifetime.